Fix loose or recessed switches and outlets with this 100-pack of red electrical box spacers. Each shim fills the gap between a device yoke and the wall box, helping the switch or outlet sit flush with tile, drywall, paneling and other finished surfaces. The stackable design lets you combine pieces until the device reaches the needed depth.Each spacer measures about 0.78 in. x 0.78 in. and folds at the center for placement behind a mounting screw. The snap-together form creates firm, adjustable support without replacing the box. The pack supplies enough pieces for many repairs, remodels and multi-device jobs in homes, offices, shops and rental units.Turn off power at the breaker before work. Loosen or remove the device screws, place the required spacers behind the mounting yoke and tighten the device until it is level and secure. These shims help when a box sits too far behind tile or drywall and the wall plate cannot hold the device in place. Check the box, screw length and device fit before use. They also help reduce gaps around the installed wall plate. The compact pieces are easy to store with other electrical repair parts. This product includes a 30-day limited warranty. Material: Polycarbonate.